161863818109002 has 48 divisors (see below), whose sum is σ = 351153413325000. Its totient is φ = 53885615718912.

The previous prime is 161863818108991. The next prime is 161863818109061. The reversal of 161863818109002 is 200901818368161.

It is a happy number.

161863818109002 is a `hidden beast` number, since 1 + 6 + 186 + 381 + 81 + 0 + 9 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 146641951995561 + 15221866113441 = 12109581^2 + 3901521^2 .

It is a super-2 number, since 2×161863818109002² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161863818109002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360170374 + ... + 360619502.

Almost surely, 2^{161863818109002} is an apocalyptic number.

161863818109002 is an abundant number, since it is smaller than the sum of its proper divisors (189289595215998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161863818109002 is a wasteful number, since it uses less digits than its factorization.

161863818109002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474695 (or 474692 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 161863818109002 in words is "one hundred sixty-one trillion, eight hundred sixty-three billion, eight hundred eighteen million, one hundred nine thousand, two".